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3K Monitor ROM Entrypoints
System Variables (1K System RAM)
RIO-OS System Addresses

RIO Memory Layout (2010-10-06)

3K Monitor ROM Entrypoints			Address (Hex)
Label	Type	Description	MCZ	ZDS	P8000	UDOS 1526
FLOPPY	Code	Entrypoint FLOPPY driver	`0bfd`	`0bfd`	`0bfd`	`0bfd`
PCON	Code	Entrypoint Console (PCON) driver	`0be8`	`0bee`	`0bee`	`0bee`
PDEBUG (DEBUG)	Code	Entrypoint ROM resident debugger	`0bfa`	`0bfa`	`0bfa`	`0bfa`

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System Variables (1K System RAM)			Address (Hex)
Label	Type	Description	MCZ	ZDS	P8000	UDOS 1526
ADRFLG	Word	Address Flag ZDS systems only: Offset for memory mapping between monitor mode und user mode. Standard value `1000H`	`%`	`0fd8`	`%`	`%`
BOOTAD	Buff	Boot Address, 128 Bytes Buffer for loading the first sector (boot record) from disk at OS-Boot	`1000`	`0c00`	`0c00`	`n.a.`
BRKFLG (DEBFL)	Byte	Break Flag Flagbyte to control breakpoints and debugger calls Hinweis: Bei UDOS-1526 als DEBFL dokumentiert.	`13cd`	`0fc4`	`0fc4`	`0fc4`
BRKRTN	Addr	Break Return Address The contents of this location specifies the address of a user-specific breakpoint handler. Acts in conjunction with BRKFLG.	`13ce`	`0fc5`	`0fc5`	`n.a.`
CHRDEL	Byte	Character Delete Character Console input: This character in an ASCII input stream deletes the last entered input character from the input buffer. Initialized with BACKSPACE (`08H`). Note: In older ROM monitors initialized with '@' (`40H`)	`13cc`	`0fc3`	`0fc3`	`0fc3`
CONIBF (INBU)	Buff	Console Input Buffer, 255 Bytes Buffer used by the ROM monitor for command line input Hinweis: Bei UDOS-1526 als INBU dokumentiert. Hinweis: Bei P8000-UDOS verkürzt auf 218 Byte wegen Floppy-Zellen. Hinweis: Bei meinem Eigenbau verkürzt auf 208 Bytes wegen Floppy-Zellen.	`1189`	`0d8a`	`0d8a`	`0d8a`
CONIVC	Buff	Console Input Request Vector, 11 Bytes I/O request vector for command line input over the PCON driver. The PCON driver never needs the supplemental parameter information field, therefore 11Bytes for the vector is enough.	`1293`	`0ece`	`0ece`	`n.a.`
CONOBF (OUTBU)	Buff	Console Output Buffer, 133 Bytes Buffer used by the ROM monitor for text line output Hinweis: Bei UDOS-1526 als OUTBU dokumentiert.	`1103`	`0d04`	`0d04`	`0d04`
CONOVC	Buff	Console Output Request Vector, 11 Bytes I/O request vector for text line output over the PCON driver. The PCON driver never needs the supplemental parameter information field, therefore 11Bytes for the vector is enough.	`1288`	`0ec3`	`0ec3`	`n.a.`
DATE	Buff	System Date, 6 Bytes System date in YYMMDD format as an ASCII string (e.g. "951023"). Setting and showing the date is done with the utility DATE. Note: Used by the RIO-OS for time stamps in file operations..	`13ab`	`0fa2`	`0fa2`	`0fa2`
DSKVC	Buff	Disk Vector, 13 Bytess I/O request vector for disk operations (booting or GET/SAVE operations) of the ROM monitor	`129e`	`0e89`	`0e89`	`n.a.`
ERCODE	Byte	Error Code RIO programs can put here the return code from their call for later analysis.	`13bd`	`0fb4`	`0fb4`	`n.a.`
EXTRET	Addr	External Return Address (Debugger Return Address) Return address to the calling program if the ROM debugger was called as a subroutine. Acts in conjunction with BRKFLG.	`13be`	`0fb5`	`0fb5`	`0fb5`
INPTR (INBUAD)	Addr	Input Buffer Pointer Console input: Pointer to an input buffer (CONIBF or the RIO-OS input buffer) for command-line analysis. Hinweis: Bei UDOS-1526 als INBUAD dokumentiert.	`13c4`	`0fbb`	`0fbb`	`0fbb`
LFCNT	Byte	Linefeed Count Console output: Number of linefeed characters (`0aH`) the console driver sends to the terminal after each carriage return (`0dH`). Initialized with 1. Note: The (ROM) PCON driver ignores this value and sends always one (1) line feed. The (OS) CON driver will take account of this value.	`13c9`	`0fc0`	`0fc0`	`n.a.`
LINDEL	Byte	Line Delete Character Console input: This character in an ASCII input stream purges the complete input buffer. Initialized with DEL (`7fH`) Note: In older ROM monitors initialized with '!' (`21H`)	`13cb`	`0fc2`	`0fc2`	`n.a.`
NCRCE	Word	Number of CRC Errors Counter of data transfer errors (CRC errors C6) of the physical disk driver FLOPPY. The current number of errors can be shown with the utility ERRORS.	`1393`	`0ee5`	`0ee5`	`0ee5`
NMIDSP (NMIRET)	Addr	NMI Dispatch The contents of this location specifies the address to branch to on Non-Maskable Interrupt (NMI). The BREAK button at Zilogs® development systems generates a NMI. Hinweis: Bei UDOS-1526 als NMIRET dokumentiert.	`%`	`0eee`	`%`	`0eee`
NSECTE	Word	Number of Sector Errors Counter of sector address errors (C4 errors) of the physical disk driver FLOPPY. The current number of errors can be shown with the utility ERRORS.	`1395`	`0ee7`	`0ee7`	`0ee7`
NTRKE	Word	Number of Track Errors Counter of track address errors (C5 errors) of the physical disk driver FLOPPY. The current number of errors can be shown with the utility ERRORS.	`1391`	`0ee9`	`0ee9`	`0ee9`
NULLCT	Byte	Null-Count Console output: Number of null characters (00H) after each carriage return and the line feed(s) to adapt slower output devices (TTY). Initialized with 0	`13c8`	`0fbf`	`0fbf`	`n.a.`
OUTPTR	Addr	Output Buffer Pointer Console output: Pointer to an output buffer (e.g. CONOBF)	`13c6`	`0fbd`	`0fbd`	`n.a.`
PROMPT	Byte	Prompt Character Console input: The console driver sends this character before each text line input request to prompt the user for input. Initialized with '>'	`13ca`	`0fc1`	`0fc1`	`n.a.`
RSTDSP (RSTRET)	Addr	RST 38 Dispatch The contents of this location specifies the address to branch to when a RST 38H instruction is executed Hinweis: Bei UDOS-1526 als RSTRET dokumentiert.	`%`	`0eec`	`%`	`0eec`
STACK	Buff	Stack space, 256 Byte downward Initial value for stackpointer, decrements on every PUSH, CALL and so on.	`1100`	`0d00`	`0d00`	`0d00`
TIME	Buff	System Time, 6 Bytes System time in HHMMSS format as an ASCII string (e.g. "091823"). Note: Requires additional real-time clock with driver and utilities.	`13b1`	`0fa8`	`n.a.`	`n.a.`

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RIO-OS System Addresses			Address (Hex)
Label	Type	Description	MCZ	ZDS	P8000	UDOS 1526
ENTRY	Buff	OS Entry and Input Buffer, 256 Bytes Input buffer of the RIO-OS for command line input. This address is the start address (entry point) of the RIO-Executive OS. There located initialization routines are run only once. After the initalization the space is used as an input buffer.	`17de`	`13de`	`n.a.`	`n.a.`
MEMMGR	Code	Memory Manager Call address for memory reservation and release (Allocate, Deallocate)	`1409`	`1009`	`1009`	`1009`
SYSCAL	Code	System I/O Handler Call address for logical I/O operations	`1403`	`1003`	`1003`	`1003`

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Meaning of the column "Type"
Addr	16bit pointer to another element in the memory (address)
Buff	Range of consecutive bytes (buffer)
Byte	8bit variable
Code	Call address of a program or system routine
Word	16bit variable
`n.a.`	in the column "Address" means that I don't have an information about this memory location on this platform. It doesn't mean that this location does not exist there.
`%`	in the column "Address" means that this memory location doesn't exist on this platform.

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3K Monitor ROM Entrypoints
System Variables (1K System RAM)
RIO-OS System Addresses